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1、
standard deviation
2、
什么是标准偏差?
1、
standard deviation
英:
美:
n.标准偏差
【物】标准偏差
1、Remember that the market portfolios
standard deviation
was about 13 percent in the 1990 s.───记得市场组合的标准差在二十世纪九十年代约为13%.
2、Average angle and
standard deviation
also available.───平均值和标准背离值同样是被用到的.
3、The
standard deviation
of average birth weight of piglets in a bigger litter increases Table 2.───窝仔数越多,平均出生重的标准差越大.
4、The relative
standard deviation
should be no greater than 2.0 %.───其相对标准偏差也应不大于2.0%.
5、The Six Sigma Black Belt should be able to compute the mean and
standard deviation
from a grouped frequency distribution.───六西格玛黑带应该能够计算出一个分组发生频次分布数据的均值和标准偏差。
6、This spread of possible outcomes is usually measured by
standard deviation
.───这一未来结果的展步通常以标准差衡量.
7、The
standard deviation
measures spread by looking at how far the observations are from their mean.───标准偏差可查看各个观测值离均值有多远,衡量数据的散布.
8、Calculate the variance and
standard deviation
of this rate of return.───计算这一回报率的方差和标准差.
9、Calculate the
standard deviation
based on the entire population.───STDEVP计算基于整个总体样本的标准偏差.
10、Risk management, for instance, depends on tools such as variance,
standard deviation
, correlation, and regression analysis.───风险管理, 例如, 依赖于工具,如方差, 标准差, 相关和回归分析.
11、The
standard deviation
was determined for both groups to determine the variance of placement.───采用标准差来确定两组中隧道位置的偏差度.
12、The result shows that
standard deviation
is 0.02, coefficient of variation linear correlation is 0.9996.───方法标准偏差为0.02, 变异系数为 0.24% .本方法可适用于霜脲氰及其复配制剂的分析.
13、Whats the deal with
standard deviation
?───标准偏差又是怎么回事呢?
14、Mainly determine the
standard deviation
of statistics and maximum and minimum values and determine the differences.───次要是猜测统计的尺度不确和最不小值和最小值之间的不同边界.
15、The rate of decreasing depends on the
standard deviation
of the data set.───降低率数据的标准差取决于集.
16、We shall standard error of estimate as a tool in the same way
standard deviation
.───同标准差一样,应该把估计值平均误差当作一个工具.
17、Uncertainty of Sample Mean and Standard Deviation.───取样平均值与标准差之不确定度.
18、A volatile stock would have a high
standard deviation
.───不稳定的股票会有一个高的标准离差.
19、Risk for our purposes in the variability of returns and may be measured
standard deviation
.───风险是预期收益不能实现的可能性,可用标准差来度量.
20、Standard deviation, RSD and confidential limItshould be reported.───均应报告标准偏差 、 相对标准偏差和可信限.
21、The lognormal distribution , like the normal, is completely specified by its mean and
standard deviation
.───对数正态分布,如同正态,以其平均值和标准差被完全地指明.
22、Limit how many times
standard deviation
a point has to be below surface to be classified.───限定多少圈标准偏差为一个点是必须低于表面并分类.
23、The
standard deviation
from the mean is the preferred quantity.───用平均值得出标准偏差是优先采用衡量的单位.
24、The best efficient portfolio offers the highest ratio of forecasted risk premium to portfolio
standard deviation
.───最优投资组合提供了最高的预计风险溢价对投资组合标准差比率.
25、What does the
standard deviation
have to do with risk?───标准差和风险有何关系?
26、Estimate the
standard deviation
based on a sample.───STDEVA估算基于一次抽样的标准偏差.
27、You cant think out a number to describe the twenty-five
standard deviation
event; its just too large a number for any of us to comprehend.───你无法想出一个数字来描述25个标准差事件;这个数字太大了,我们任何人都无法理解。
28、Mathematicians call this the second
standard deviation
channel.───数学家说这是第二条标准背离通道.
29、Results The correction factor was 0.8551 and relative
standard deviation
( RSD ) was less than 3.5 %.───结果校正因子为 0.8551,本方法相对标准偏差小于3.5%,精密度、灵敏度较高.
1、standardisation───n.标准化
2、standard amenities───标准设施
3、standardization───n.标准化;【数】规格化;校准
4、standard function───【数】标准函数
5、standard deviations───【统计】标准差
6、mean deviation───【数】平均偏差;【数】平均偏移;均差
7、standard functions───【数】标准函数
8、mean square deviation───均方离差;标准差
9、standard of education───教育标准
2、
什么是标准偏差?
标准偏差
标准差(Standard Deviation),是在概率统计中最常使用,作为统计分布程度(statistical dispersion)上的测量。标准差定义为方差的算术平方根,反映组内个体间的离散程度。测量到分布程度的结果,原则上具有两种性质:一个总量的标准差或一个随机变量的标准差,及一个子集合样品数的标准差之间,有所差别,其公式如下所列。标准差的观念是由卡尔·皮尔逊(Karl Pearson)引入到统计中。
公式
标准偏差公式:S = Sqrt【(∑(xi-x拔)^2) /(N-1)】公式中∑代表总和,x拔代表x的均值,^2代表二次方,Sqrt代表平方根。
STDEV基于样本估算标准偏差。标准偏差反映数值相对于平均值(mean) 的离散程度。
其他定义
标准差也被称为标准偏差,或者实验标准差,标准差(Standard Deviation)各数据偏离平均数的距离(离均差)的平均数,它是离差平方和平均后的方根。用σ表示。因此,标准差也是一种平均数。标准差是方差的算术平方根。标准差能反映一个数据集的离散程度。平均数相同的,标准差未必相同。